Multiscaling of lattice curvature on friction surfaces of metallic materials as a basis of their wear mechanism

Панин, В. Е.; Pinchuk, V. G.; Korotkevich, S. V.; Panin, S. V.

doi:10.1134/s1029959917010064

Cited by 9 publications

(3 citation statements)

References 18 publications

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“…An electron microscopic analysis of samples from Fe-based powder made it possible to establish the smallest particle size, crystallized from the condensate drops: 0.15 ± 0.05 μm (figure 7). In the physical thermoformation theory of strength [13] the sublimation with the formation of germinal microcracks with such a size is due to irreversible breaks of interatomic connections. In the case of steam condensation and the transition of the liquid state into solid, the return process should be assumeddesublimation with a phase transition of the first kind, where the total symmetry of the condensed liquid medium turns into a periodic symmetry of the solid.…”

Section: Resultsmentioning

confidence: 99%

Structural studies of samples manufactured by selective laser melting of the Fe-based powder

Zhukov

Vasilyeva

Старицын

et al. 2022

J. Phys.: Conf. Ser.

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In the structure of the samples manufactured by the additive method of selective laser melting (SLM) of the Fe-based powder, particles were detected with a minimum size of 0.15 ± 0.05 μm, which were interpreted as germ objects of solidification. The model of additive samples hardening by nanoparticles was proposed, which were formed in the process of desublimations (condensation of metal vapors + crystallization) in the sequence: Metastable state to Segregation to Cluster to Nano-object.

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Section: Resultsmentioning

confidence: 99%

Structural studies of samples manufactured by selective laser melting of the Fe-based powder

Zhukov

Vasilyeva

Старицын

et al. 2022

J. Phys.: Conf. Ser.

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“…The formation and detachment of debris particles were associated with the rotational-shear nature of plastic flow in the sample surface layers. The development of rotational deformation modes occurred due to the moments of tangential forces oriented parallel to the sliding direction and the gradient of internal friction stresses in the coating [38]. This caused the rotation of local fragments of the surface layer, which, in combination with the high friction coefficients, contributed to the intensive formation of debris particles.…”

Section: Discussionmentioning

confidence: 99%

Transformations of the Microstructure and Phase Compositions of Titanium Alloys during Ultrasonic Impact Treatment Part III: Combination with Electrospark Alloying Applied to Additively Manufactured Ti-6Al-4V Titanium Alloy

Panin

Kazachenok

Круковский

et al. 2023

Metals

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Scanning electron microscopy, 3D optical surface profilometry, as well as X-ray diffraction and electron backscatter diffraction analysis were implemented for studying the effects of both ultrasonic impact treatment (UIT) and ultrasonic impact electrospark treatment (UIET) procedures on the microstructure, phase composition, as well as the mechanical and tribological properties of Ti-6Al-4V samples fabricated by wire-feed electron beam additive manufacturing. It was shown that he UIET procedure with the WC-6%Co striker enabled to deposit the ~10 µm thick coating, which consists of fine grains of both tungsten and titanium-tungsten carbides, as well as titanium oxide. For the UIET process, the effect of shielding gas on the studied parameters was demonstrated. It was found that the UIET procedure in argon resulted in the formation of a dense, continuous and thick (~20 µm) coating. After the UIET procedures in air and argon, the microhardness levels were 26 and 16 GPa, respectively. After tribological tests, wear track surfaces were examined on the as-built sample, as well as the ones subjected to the UIT and UIET procedures. It was shown that the coating formed during UIET in air had twice the wear resistance compared to the coating formed in argon. The evidence showed that the multiple impact of a WC-Co striker with simultaneous electrical discharges was an effective way to improve wear resistance of the Ti-6Al-4V sample.

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“…The behavior of the material in contact zones is a complex multiscale process [1], which depends on a number of parameters: the roughness of the contacting surfaces, the chemical composition of materials, loading parameters, etc. [2].…”

Section: Introductionmentioning

confidence: 99%

Regularities of Structural Rearrangements in Single- and Bicrystals Near the Contact Zone

Zolnikov

Крыжевич

Korchuganov

2020

Springer Tracts in Mechanical Engineering

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The chapter is devoted to the analysis of the features of local structural rearrangementsin nanostructured materialsunder shear loadingand nanoindentation. The study was carried out using molecular dynamics-based computer simulation. In particular, we investigated the features of symmetric tilt grain boundary migration in bcc and fcc metals under shear loading. The main emphasis was on identifying atomic mechanisms responsible for the migration of symmetric tilt grain boundaries. We revealed that grain boundaries of this type can move with abnormally high velocities up to several hundred meters per second. The grain boundary velocity depends on the shear rate and grain boundary structure. It is important to note that the migration of grain boundary does not lead to the formation of structural defects. We showed that grain boundary moves in a pronounced jump-like manner as a result of a certain sequence of self-consistent displacements of grain boundary atomic planes and adjacent planes. The number of atomic planes involved in the migration process depends on the structure of the grain boundary. In the case of bcc vanadium, five planes participate in the migration of the Σ5(210)[001] grain boundary, and three planes determine the Σ5(310)[001] grain boundary motion. The Σ5(310)[001] grain boundary in fcc nickel moves as a result of rearrangements of six atomic planes. The stacking order of atomic planes participating in the grain boundary migration can change. A jump-like manner of grain boundary motion may be divided into two stages. The first stage is a long time interval of stress increase during shear loading. The grain boundary is motionless during this period and accumulates elastic strain energy. This is followed by the stage of jump-like grain boundary motion, which results in rapid stress drop. The related study was focused on understanding the atomic rearrangements responsible for the nucleation of plasticity near different crystallographic surfaces of fcc and bcc metals under nanoindentation. We showed that a wedge-shaped region, which consists of atoms with a changed symmetry of the nearest environment, is formed under the indentation of the (001) surface of the copper crystallite. Stacking faults arise in the (111) atomic planes of the contact zone under the indentation of the (011) surface. Their escape on the side free surface leads to a step formation. Indentation of the (111) surface is accompanied by nucleation of partial dislocations in the contact zone subsequent formation of nanotwins. The results of the nanoindentation of bcc iron bicrystal show that the grain boundary prevents the propagation of structural defects nucleated in the contact zone into the neighboring grain.

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Multiscaling of lattice curvature on friction surfaces of metallic materials as a basis of their wear mechanism

Cited by 9 publications

References 18 publications

Structural studies of samples manufactured by selective laser melting of the Fe-based powder

Structural studies of samples manufactured by selective laser melting of the Fe-based powder

Transformations of the Microstructure and Phase Compositions of Titanium Alloys during Ultrasonic Impact Treatment Part III: Combination with Electrospark Alloying Applied to Additively Manufactured Ti-6Al-4V Titanium Alloy

Regularities of Structural Rearrangements in Single- and Bicrystals Near the Contact Zone

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